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[AMPS] 5cx1500a information

To: <amps@contesting.com>
Subject: [AMPS] 5cx1500a information
From: 2@vc.net (2)
Date: Sat, 17 Nov 2001 02:25:22 -0800
>
>> In an old 5CX3000A 1.6-32MHz amp I am working on, 
>> the plate blocking caps are rated at 8KV. Can I 
>> guesstimate from this what plate voltage was intended? 
>-
>I have worked on FM broadcast transmitters and Henry HF 
>amplifiers using the 5CX1500A and B series tubes.  If you 
>want information about any of said, I can supply it. 
>- 
>Henry made (IMO) a dog of an HF amplifier using this tube, 
>for a short time it was popular in Elcom Bauer and Sparta 
>FM Broadcast Transmitters.  Probably other brands used it. 
>- 
>The Sparta 602 is a long lasting unit running a tap selected 
>output,high voltage supply is used to set the output power.  
>From memory the thing would easily honk 2200 plus watts 
>out on 95.3 Mhz a big 24/7 . 
>- 
>The tube can be rebuilt...  I was told the A&B versions are a 
>bit different, which includes separate socket requirements, 
>but actual direct swapping worked in two VHF examples. 
>-
>Gas is a big concern...  I would give it at least an two to four 
>hours warm up after a slow ramp to the rated min filament 
>voltage.  Depends on how long it's been idle. 
>-
>This tube seems more sensitive to proper heater voltage than 
>any other I've worked with.  I would never apply screen voltage 
>without  something near the proper min anode potential.  
>When its going full tilt, it is an incredibly bright light source. 

Does light come from the ceramic anode-insulator?  If so, what color is 
the light?
thanks

-  R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.  
end


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